US PATENT SUBCLASS 361 / 205
.~.~ Threshold device (e.g., SCR, thyratron)

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361 /   HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

139  DF  CONTROL CIRCUITS FOR ELECTROMAGNETIC DEVICES {7}
160  DF  .~ For relays or solenoids {11}
205.~.~ Threshold device (e.g., SCR, thyratron)

DEFINITION

Classification: 361/205

Threshold device (e.g., SCR, thyratron):

(under subclass 160) Subject matter wherein a threshold device, which conducts current when the potential applied across it reaches a specific value, is connected to the coil of the electromagnetic device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

197+, and 200+, for threshold devices in time delay control circuits.